In figure "A" of the illustration, 12 volts is applied to the circuit where the resistance of R1 is 10 ohms and R2 is 10 ohms. what is the voltage across R2 when the switch is closed? See illustration EL-0020.
• Identify whether R1 and R2 are in series or parallel when the switch is closed in figure A • Use Ohm’s Law (V = I \times R) and the idea of voltage division in a series circuit • Find the total resistance of the circuit, then the current, then the voltage across one resistor
• When the switch is closed, how does current flow from the source Es through the fuse, switch, R1, and R2? Trace the single path. • If the total applied voltage is 12 V and R1 and R2 have the same resistance, how will the total voltage be shared between them in a series circuit? • After you find the circuit current, what voltage do you get across R2 using V = I × R, with R2 = 10 Ω?
• Confirm that R1 and R2 are in series (only one path for current) and not parallel in figure A • Correctly calculate total resistance as the sum of R1 and R2 before finding current • Re-check your arithmetic when multiplying current × 10 Ω to find the voltage across R2
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